src/Pure/theory.ML
author paulson
Fri, 05 Oct 2007 09:59:03 +0200
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child 24966 70111480b84b
permissions -rw-r--r--
filtering out some package theorems
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(*  Title:      Pure/theory.ML
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    ID:         $Id$
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    Author:     Lawrence C Paulson and Markus Wenzel
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Logical theory content: axioms, definitions, oracles.
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*)
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signature BASIC_THEORY =
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sig
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  val eq_thy: theory * theory -> bool
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  val subthy: theory * theory -> bool
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end
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signature THEORY =
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sig
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  include BASIC_THEORY
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  include SIGN_THEORY
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  val assert_super: theory -> theory -> theory
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  val parents_of: theory -> theory list
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  val ancestors_of: theory -> theory list
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  val check_thy: theory -> theory_ref
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  val deref: theory_ref -> theory
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  val merge: theory * theory -> theory
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  val merge_refs: theory_ref * theory_ref -> theory_ref
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  val merge_list: theory list -> theory
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  val checkpoint: theory -> theory
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  val copy: theory -> theory
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  val requires: theory -> string -> string -> unit
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  val axiom_space: theory -> NameSpace.T
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  val axiom_table: theory -> term Symtab.table
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  val oracle_space: theory -> NameSpace.T
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  val oracle_table: theory -> ((theory * Object.T -> term) * stamp) Symtab.table
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  val axioms_of: theory -> (string * term) list
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  val all_axioms_of: theory -> (string * term) list
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  val defs_of: theory -> Defs.T
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  val at_begin: (theory -> theory option) -> theory -> theory
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  val at_end: (theory -> theory option) -> theory -> theory
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  val begin_theory: string -> theory list -> theory
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  val end_theory: theory -> theory
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  val add_axioms: (bstring * string) list -> theory -> theory
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  val add_axioms_i: (bstring * term) list -> theory -> theory
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  val add_deps: string -> string * typ -> (string * typ) list -> theory -> theory
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  val add_defs: bool -> bool -> (bstring * string) list -> theory -> theory
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  val add_defs_i: bool -> bool -> (bstring * term) list -> theory -> theory
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  val add_finals: bool -> string list -> theory -> theory
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  val add_finals_i: bool -> term list -> theory -> theory
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  val add_oracle: bstring * (theory * Object.T -> term) -> theory -> theory
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end
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structure Theory: THEORY =
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struct
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(** theory context operations **)
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val eq_thy = Context.eq_thy;
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val subthy = Context.subthy;
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fun assert_super thy1 thy2 =
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  if subthy (thy1, thy2) then thy2
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  else raise THEORY ("Not a super theory", [thy1, thy2]);
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val parents_of = Context.parents_of;
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val ancestors_of = Context.ancestors_of;
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val check_thy = Context.check_thy;
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val deref = Context.deref;
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val merge = Context.merge;
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val merge_refs = Context.merge_refs;
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fun merge_list [] = raise THEORY ("Empty merge of theories", [])
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  | merge_list (thy :: thys) = Library.foldl merge (thy, thys);
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val checkpoint = Context.checkpoint_thy;
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val copy = Context.copy_thy;
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fun requires thy name what =
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  if Context.exists_name name thy then ()
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  else error ("Require theory " ^ quote name ^ " as an ancestor for " ^ what);
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(** theory wrappers **)
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type wrapper = (theory -> theory option) * stamp;
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fun apply_wrappers (wrappers: wrapper list) =
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  let
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    fun app [] res = res
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      | app ((f, _) :: fs) (changed, thy) =
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          (case f thy of
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            NONE => app fs (changed, thy)
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          | SOME thy' => app fs (true, thy'));
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    fun app_fixpoint thy =
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      (case app wrappers (false, thy) of
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        (false, _) => thy
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      | (true, thy') => app_fixpoint thy');
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  in app_fixpoint end;
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(** datatype thy **)
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datatype thy = Thy of
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 {axioms: term NameSpace.table,
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  defs: Defs.T,
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  oracles: ((theory * Object.T -> term) * stamp) NameSpace.table,
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  wrappers: wrapper list * wrapper list};
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fun make_thy (axioms, defs, oracles, wrappers) =
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  Thy {axioms = axioms, defs = defs, oracles = oracles, wrappers = wrappers};
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fun err_dup_axm dup = error ("Duplicate axiom: " ^ quote dup);
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fun err_dup_ora dup = error ("Duplicate oracle: " ^ quote dup);
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structure ThyData = TheoryDataFun
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(
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  type T = thy;
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  val empty = make_thy (NameSpace.empty_table, Defs.empty, NameSpace.empty_table, ([], []));
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  val copy = I;
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  fun extend (Thy {axioms, defs, oracles, wrappers}) =
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    make_thy (NameSpace.empty_table, defs, oracles, wrappers);
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  fun merge pp (thy1, thy2) =
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    let
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      val Thy {axioms = _, defs = defs1, oracles = oracles1, wrappers = (bgs1, ens1)} = thy1;
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      val Thy {axioms = _, defs = defs2, oracles = oracles2, wrappers = (bgs2, ens2)} = thy2;
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      val axioms' = NameSpace.empty_table;
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      val defs' = Defs.merge pp (defs1, defs2);
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      val oracles' = NameSpace.merge_tables (eq_snd (op =)) (oracles1, oracles2)
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        handle Symtab.DUP dup => err_dup_ora dup;
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      val bgs' = Library.merge (eq_snd op =) (bgs1, bgs2);
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      val ens' = Library.merge (eq_snd op =) (ens1, ens2);
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    in make_thy (axioms', defs', oracles', (bgs', ens')) end;
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);
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fun rep_theory thy = ThyData.get thy |> (fn Thy args => args);
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fun map_thy f = ThyData.map (fn (Thy {axioms, defs, oracles, wrappers}) =>
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  make_thy (f (axioms, defs, oracles, wrappers)));
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fun map_axioms f = map_thy
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  (fn (axioms, defs, oracles, wrappers) => (f axioms, defs, oracles, wrappers));
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fun map_defs f = map_thy
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  (fn (axioms, defs, oracles, wrappers) => (axioms, f defs, oracles, wrappers));
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fun map_oracles f = map_thy
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  (fn (axioms, defs, oracles, wrappers) => (axioms, defs, f oracles, wrappers));
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fun map_wrappers f = map_thy
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  (fn (axioms, defs, oracles, wrappers) => (axioms, defs, oracles, f wrappers));
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(* basic operations *)
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val axiom_space = #1 o #axioms o rep_theory;
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val axiom_table = #2 o #axioms o rep_theory;
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val oracle_space = #1 o #oracles o rep_theory;
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val oracle_table = #2 o #oracles o rep_theory;
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val axioms_of = Symtab.dest o #2 o #axioms o rep_theory;
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fun all_axioms_of thy = maps axioms_of (thy :: ancestors_of thy);
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val defs_of = #defs o rep_theory;
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(* begin/end theory *)
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val begin_wrappers = rev o #1 o #wrappers o rep_theory;
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val end_wrappers = rev o #2 o #wrappers o rep_theory;
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fun at_begin f = map_wrappers (apfst (cons (f, stamp ())));
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fun at_end f = map_wrappers (apsnd (cons (f, stamp ())));
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fun begin_theory name imports =
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  let
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    val thy = Context.begin_thy Sign.pp name imports;
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    val wrappers = begin_wrappers thy;
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  in thy |> Sign.local_path |> apply_wrappers wrappers end;
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fun end_theory thy =
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  thy |> apply_wrappers (end_wrappers thy) |> Context.finish_thy;
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(* signature operations *)
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structure SignTheory: SIGN_THEORY = Sign;
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open SignTheory;
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(** add axioms **)
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(* prepare axioms *)
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fun err_in_axm msg name =
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  cat_error msg ("The error(s) above occurred in axiom " ^ quote name);
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fun cert_axm thy (name, raw_tm) =
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  let
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    val (t, T, _) = Sign.certify_prop thy raw_tm
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      handle TYPE (msg, _, _) => error msg
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        | TERM (msg, _) => error msg;
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  in
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    Term.no_dummy_patterns t handle TERM (msg, _) => error msg;
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    (name, Sign.no_vars (Sign.pp thy) t)
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  end;
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fun read_axm thy (name, str) =
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  cert_axm thy (name, Syntax.read_prop_global thy str)
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    handle ERROR msg => err_in_axm msg name;
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(* add_axioms(_i) *)
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local
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fun gen_add_axioms prep_axm raw_axms thy = thy |> map_axioms (fn axioms =>
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  let
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    val axms = map (apsnd (Compress.term thy o Logic.varify) o prep_axm thy) raw_axms;
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    val axioms' = NameSpace.extend_table (Sign.naming_of thy) axms axioms
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      handle Symtab.DUP dup => err_dup_axm dup;
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  in axioms' end);
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in
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val add_axioms = gen_add_axioms read_axm;
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val add_axioms_i = gen_add_axioms cert_axm;
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end;
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(** add constant definitions **)
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(* dependencies *)
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fun dependencies thy unchecked is_def name lhs rhs =
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  let
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    val pp = Sign.pp thy;
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    val consts = Sign.consts_of thy;
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    fun prep const =
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      let val Const (c, T) = Sign.no_vars pp (Const const)
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      in (c, Consts.typargs consts (c, Compress.typ thy (Logic.varifyT T))) end;
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    val lhs_vars = Term.add_tfreesT (#2 lhs) [];
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    val rhs_extras = fold (#2 #> Term.fold_atyps (fn TFree v =>
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      if member (op =) lhs_vars v then I else insert (op =) v | _ => I)) rhs [];
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    val _ =
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      if null rhs_extras then ()
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      else error ("Specification depends on extra type variables: " ^
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        commas_quote (map (Pretty.string_of_typ pp o TFree) rhs_extras) ^
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        "\nThe error(s) above occurred in " ^ quote name);
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  in Defs.define pp unchecked is_def name (prep lhs) (map prep rhs) end;
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fun add_deps a raw_lhs raw_rhs thy =
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  let
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    val lhs :: rhs = map (dest_Const o Sign.cert_term thy o Const) (raw_lhs :: raw_rhs);
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    val name = if a = "" then (#1 lhs ^ " axiom") else a;
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  in thy |> map_defs (dependencies thy false false name lhs rhs) end;
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(* check_overloading *)
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fun check_overloading thy overloaded (c, T) =
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  let
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    val declT = Sign.the_const_constraint thy c
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      handle TYPE (msg, _, _) => error msg;
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    val T' = Logic.varifyT T;
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    fun message txt =
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      [Pretty.block [Pretty.str "Specification of constant ",
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        Pretty.str c, Pretty.str " ::", Pretty.brk 1, Pretty.quote (Sign.pretty_typ thy T)],
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        Pretty.str txt] |> Pretty.chunks |> Pretty.string_of;
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  in
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    if Sign.typ_instance thy (declT, T') then ()
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    else if Type.raw_instance (declT, T') then
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      error (Library.setmp show_sorts true
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        message "imposes additional sort constraints on the constant declaration")
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    else if overloaded then ()
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    else warning (message "is strictly less general than the declared type");
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    (c, T)
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  end;
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(* check_def *)
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fun check_def thy unchecked overloaded (bname, tm) defs =
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  let
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    val name = Sign.full_name thy bname;
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    val (lhs_const, rhs) = Sign.cert_def (Sign.pp thy) tm;
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    val rhs_consts = fold_aterms (fn Const const => insert (op =) const | _ => I) rhs [];
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    val _ = check_overloading thy overloaded lhs_const;
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  in defs |> dependencies thy unchecked true name lhs_const rhs_consts end
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  handle ERROR msg => cat_error msg (Pretty.string_of (Pretty.block
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   [Pretty.str ("The error(s) above occurred in definition " ^ quote bname ^ ":"),
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    Pretty.fbrk, Pretty.quote (Sign.pretty_term thy tm)]));
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(* add_defs(_i) *)
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local
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fun gen_add_defs prep_axm unchecked overloaded raw_axms thy =
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  let val axms = map (prep_axm thy) raw_axms in
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    thy
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    |> map_defs (fold (check_def thy unchecked overloaded) axms)
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    |> add_axioms_i axms
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  end;
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in
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val add_defs_i = gen_add_defs cert_axm;
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val add_defs = gen_add_defs read_axm;
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end;
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(* add_finals(_i) *)
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local
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fun gen_add_finals prep_term overloaded args thy =
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  let
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    fun const_of (Const const) = const
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      | const_of (Free _) = error "Attempt to finalize variable (or undeclared constant)"
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      | const_of _ = error "Attempt to finalize non-constant term";
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    fun specify (c, T) = dependencies thy false false (c ^ " axiom") (c, T) [];
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    val finalize = specify o check_overloading thy overloaded o const_of o
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      Sign.cert_term thy o prep_term thy;
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  in thy |> map_defs (fold finalize args) end;
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in
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val add_finals = gen_add_finals Syntax.read_term_global;
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val add_finals_i = gen_add_finals (K I);
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end;
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(** add oracle **)
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fun add_oracle (bname, oracle) thy = thy |> map_oracles (fn oracles =>
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  NameSpace.extend_table (Sign.naming_of thy) [(bname, (oracle, stamp ()))] oracles
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    handle Symtab.DUP dup => err_dup_ora dup);
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end;
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structure BasicTheory: BASIC_THEORY = Theory;
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open BasicTheory;